{"product_id":"6840-4065-392-6-4-small-block-mopar-hemi-gen-iii-fx-series-1-5cc-flat-top-gen-iii-hemi-forged-piston-set-4-065-inch-bore-pin-dia-0-927-comp-height-1-21","title":"DSS Racing FX Series Gen III Hemi Forged Piston Set 4.065\" Bore: Fits most Hemi Models","description":"\u003ch3\u003eDSS Racing FX Series Gen III Hemi Forged Piston Set\u003c\/h3\u003e\u003cp\u003eFits Most Chrysler \/ Dodge \/ Jeep \/ Ram 6.4L 392 Models\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e1-6840-4065C \/ 2-6840-4065C \/ 3-6840-4065C \/ K1-6840-4065C \/ K2-6840-4065C \/ K3-6840-4065C\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eOverview:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe DSS Racing FX Series Gen III Hemi Forged Piston Set is engineered specifically for the Chrysler, Dodge, Jeep, and Ram 6.4L 392 engines. Designed for high-performance applications, these pistons provide exceptional strength and durability to withstand the rigors of racing and aggressive street use. Whether you’re building a high-output street machine or a track-ready race engine, this piston set offers reliable performance and precision fitment for the 386 Small Block Mopar Hemi Gen III platform.\u003c\/p\u003e\u003cp\u003eWith a 4.065\" bore size and a compact 1.21\" compression height, these forged pistons are optimized for improved combustion efficiency and power delivery. The set is ideal for enthusiasts and professional builders seeking to maximize engine longevity and performance under demanding conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThese DSS Racing pistons incorporate advanced design and manufacturing techniques to ensure top-tier performance and reliability:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eForged construction for superior strength and resistance to high stress\u003c\/li\u003e\n\u003cli\u003eFlat top piston design with a -1.5cc dish for optimized combustion chamber volume\u003c\/li\u003e\n\u003cli\u003ePin diameter of .927\" compatible with full-floating or press-fit configurations\u003c\/li\u003e\n\u003cli\u003ePrecision ring grooves sized at 1.2mm \/ 1.2mm \/ 3mm for effective sealing and reduced friction\u003c\/li\u003e\n\u003cli\u003eCompatible with 3.720\" stroke crankshafts and 6.2\" connecting rods\u003c\/li\u003e\n\u003cli\u003eAvailable in multiple combustion chamber volumes (65cc, 74cc, 85cc) to tailor compression ratios\u003c\/li\u003e\n\u003cli\u003eApproximate compression ratios ranging from 9.28:1 to 11.47:1 depending on chamber size\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for the 386 Small Block Mopar Hemi Gen III platform\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eConstruction \u0026amp; Design:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEach piston in the FX Series is crafted from high-grade forged aluminum alloy, providing an excellent balance of lightweight design and exceptional durability. The forging process enhances the metal’s grain structure, resulting in pistons that resist cracking, scuffing, and thermal fatigue under extreme operating conditions.\u003c\/p\u003e\u003cp\u003eThe flat top design with a slight dish (-1.5cc) optimizes combustion efficiency and helps manage detonation, while the ring grooves are precision-machined to maintain optimal ring seal and reduce blow-by. The pistons accommodate either full-floating or press-fit wrist pins, offering flexibility for various engine builds and preferences.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation \u0026amp; Fitment:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis piston set is engineered for direct fitment in most Chrysler, Dodge, Jeep, and Ram 6.4L 392 Hemi engines, making it an ideal upgrade for performance rebuilds or engine swaps. Installation requires standard machining and assembly procedures consistent with high-performance engine builds. Proper ring end gap and clearance checks are recommended to ensure optimal performance and longevity.\u003c\/p\u003e\u003cp\u003eThese pistons are compatible with a 4.065\" bore and designed to work seamlessly with the 3.720\" stroke crankshaft and 6.2\" connecting rods typical of the Gen III Hemi platform.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSet of 8 forged pistons with flat top design\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves\u003c\/li\u003e\n\u003cli\u003eCompatible wrist pin options (full-floating or press-fit)\u003c\/li\u003e\n\u003cli\u003eTechnical specifications and installation guidelines\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIdeal For:\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis piston set is perfect for engine builders, racers, and performance enthusiasts who demand reliable, high-strength components for their 6.4L Hemi builds. Whether upgrading a street performance engine or constructing a race-ready powerplant, these pistons provide the durability and precision needed to handle increased boost, higher RPMs, and aggressive tuning.\u003c\/p\u003e","brand":"DSS Racing","offers":[{"title":"FX-1 4032 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381016314068,"sku":"1-6840-4065C","price":689.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins and Locs Without Rings","offer_id":47381016346836,"sku":"2-6840-4065C","price":719.95,"currency_code":"USD","in_stock":true},{"title":"FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs \/ Pistons - Pins and Locs Without Rings","offer_id":47381016379604,"sku":"3-6840-4065C","price":899.95,"currency_code":"USD","in_stock":true},{"title":"FX-1 4032 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381016412372,"sku":"K1-6840-4065C","price":867.95,"currency_code":"USD","in_stock":true},{"title":"FX-2 2618 Alloy \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381016445140,"sku":"K2-6840-4065C","price":897.95,"currency_code":"USD","in_stock":true},{"title":"FX-3 2618 Alloy with Lateral Gas Ports - XR .225 Wall Pin Upgrade - Spiro Locs \/ Pistons - Pins - Locs With DSS Racing Rings in a Kit","offer_id":47381016477908,"sku":"K3-6840-4065C","price":1087.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/8542\/1268\/files\/0002066_4_c0a5947a-23ef-4cfd-aed0-3af819d3ccd5.webp?v=1771667002","url":"https:\/\/fasthemis.com\/products\/6840-4065-392-6-4-small-block-mopar-hemi-gen-iii-fx-series-1-5cc-flat-top-gen-iii-hemi-forged-piston-set-4-065-inch-bore-pin-dia-0-927-comp-height-1-21","provider":"FastHemis","version":"1.0","type":"link"}